Method of packing acid sulphates and the like compounds



Nov. 5, 1935. L. LOWENSTEIN METHOD OF PAGK ING ACID SULPHATES AND THE LIKE COMPOUNDS Filed June 29, 1954 INVENTOR.

ATTORNEY.

Patented Nov. 5, 1935 UNITED STATES METHOD OF PACKING ACID SULPHATES AND THE LIKE ooMPoU ns Leo Liiwenstein, Berlin-Wilmersdorf, Germany Application June 29, 1934, Serial No. 733,129 In Germany September 1, 1930 2 Claims.

This invention relates to the packing of compounds having an acid reaction and capable of destroying the ordinary packing material, and more particularly to a method of packing acid 5 sulphates, such as bisulphates, and the like compounds.

Hitherto, for packing said compounds, as a rule, lead sheet, sheet metal covered with lead, ceramic material and other packing material being resistant to the action of concentrated sulphuric acid, has been used. For, the usual packing materials of animal and vegetable origin cannot be used for this purpose since they are more or less rapidly destroyed by the action of the concentrated sulphuric acid which is liberated from the bisulphate or the like compounds on access of moist, not-dried air.

Difiiculties of a special kind arise when small quantities of bisulphates and the like compounds in the form of small lumps are to be packed so that they can be safely handled by inexperienced persons. Thus in the German Patent specifications Nos. 198,866 and 205,138, for instance bothersome methods-for storing and using bisulphate in handy quantities are disclosed. According to these patents the bisulphate is cast into blocks which later are parafiined. The blocks consequently do not have a very high rate of solution so that in cases where their rapid dissolutionis necessary, as in the extinction of fires and the preparing of baths, they cannot always be used successfully.

Now, it has been found that it is possible to pack bisulphate and the like compounds even in the state of small lumps or powder, in any desired quantities in cellulosic products or the like usual packing materials of vegetable or animal origin by proceeding as follows:

Dry bisulphate, for instance, is filled into a container made of one of the said substances, such as a paper bag, the container is closed in the'usual manner by creasing and then introduced into a second container, for instance into a larger bag, box or'the like of any desired material, filled with so much soda or sodium bicarbonate that the latter encloses the bisulphate bag in a continuous layer. This layer of bicarbonate surrounding the bisulphate packing is continuously maintained by the pressure exerted downwardly and laterally by 50 the bisulphate bag owing to its weight. Although the inner wrapping gradually becomes brittle this is no drawback; for in the meantime the contact surfaces of the two salts will have reached a stable state owing to the internal pressure and no further mixing will take place.

The flexibility of these packages makes them particularly adapted for carbonic acid evolution since it is possible to accelerate the gas current by pressing. They are particularly of use where hitherto expensive organic acids or acid salts 5 thereof have had to be used in place of bisulphate for technical and medicinal purposes merely for the reason that the packing difliculties which arise when using bisulphate could not be overcome.

In the accompanying drawing constituting a 10 part hereof, the single figure is an elevational View of a package made in accordance with my invention, some parts being broken away for clearness.

There is provided an outer container 1 of any suitable shape and material capable of holding 15 V forth. If water is allowed to flow into the package after opening the Wrapping at the end intended therefore, then carbonic acid is evolved immediately. The carbonic .acid is caused to evolve at the place of the fire when the package is to be used as a fire extinguishing device. The package may also be taken into the bath and even into open Waters if it is to be used for evolving carbonic acid for medicinal purposes. While in the above mentioned cases of application the fact that one may use and obtain only water-soluble compounds, represents an advantage of this method, in the latter case, i. e. when using the package for evolving carbonic acid for bathing purposes, also aluminum sulphate and the like compounds may be used although they form an insoluble residue on decomposition.

This method of packing is particularly suitable in cases where'streams of foam containing carbonic acid are to be produced as for instance for extinguishing fires and for preparing foam baths in the known manner. For this purpose saponin or some other foam-producing agent is mixed with the bicarbonate.

It is aknown disadvantage with carbonic acid 5 baths that the acid liberated above the bath is harmful to the bathers. This disadvantage can be obviated by using persulphate instead of hisulphate. A still stronger admixture of oxygen is produced if percarbonate is used as outer layer.

These substances act on the packing like bisulphate and bicarbonate.

Of course, many variations and changes in the described method may be made by those skilled in the art in accordance with the principles set forth herein and in the claims annexed hereto.

What I claim is:

1. A durable package of sulphates having an acid reaction and being capable of destroying the ordinary cellulosic packing material comprising an outer container having an alkali metal carbonic acid salt capable of reacting with said sulphate, an inner container of said cellulosic material, sub-divided acid sulphate in said inner container and completely surrounded thereby, said inner container being completely surrounded by said salt.

2. A durable package of sulphates having an acid reaction and being capable of destroying the ordinary cellulosic packing material comprising an outer container having an alkali metal bicarbonate capable of reacting with said sulphate, an inner container of paper, subdivided acid sulphate in said inner container and completely sur rounded thereby, said inner container being completely surrounded by said bicarbonate.

LEO Lownns'mm. 

